ENTERING SELF-DIAGNOSTICS

Using (MIL)
88–94

Turn ignition On.
On all models except Pathfinder, Pickup and Van, proceed as follows:
Turn diagnostic mode selector on ECU fully clockwise and wait until inspection lamps flash. Number of flashes displayed indicates corresponding mode.
Note number of flashes, then immediately turn diagnostic mode selector fully counterclockwise.
3. On Pathfinder, Pickup and Van models, proceed as follows:
Turn diagnostic mode selector on ECU to On position and wait until inspection lamps flash.
Note number of flashes, then immediately turn diagnostic mode selector to Off position.
On all models, when ignition is turned Off during diagnosis, in each mode, and then turned back On again after power to the ECU has dropped off completely, diagnosis will automatically return to Mode I.
For description of modes, proceed as follows:

Mode I (Mixture ratio feedback control monitor A): during a closed loop condition, the green inspection lamp turns on when lean condition is present and goes off when a rich condition is present. During an open loop condition, the green inspection lamp stays off.

Mode II (Mixture ratio feedback control monitor B): during a closed loop condition, the red inspection lamp turns on and off simultaneously with the green inspection lamp when mixture ratio is controlled within a predetermined value. During an open loop condition, the red inspection lamp stays off. The green inspection lamp function is the same as in Mode I.

Mode III (Self diagnosis): in this mode the DTC is indicated by both the red and greed inspection lamp. The red inspection lamp corresponds to units of 10; the green inspection lamp corresponds to units of one.

Mode IV (Switches on/off diagnosis): during this mode, the inspection lamps monitor switch on/off condition of the throttle valve switch, starter switch and vehicle speed sensor.

Mode V (Real time diagnosis): if a malfunction is present during a driving test, the inspection lamps will display the malfunction condition immediately.

95–99

Turn ignition On.
Turn diagnostic mode selector on ECU fully clockwise and wait until inspection lamps flash. Number of flashes displayed indicates corresponding mode.
Note number of flashes, then immediately turn diagnostic mode selector fully counterclockwise.
If ignition is turned Off during diagnosis, in each mode, and then turned back on again after power to the ECU has dropped off completely, diagnosis will automatically return to Mode I.
For description of modes, proceed as follows:

(Mode I): with engine stopped, system in bulb check state. with engine running, system in malfunction warning state.

(Mode II): with engine stopped, system in self diagnostic results state. with engine running, system in front O2S monitor state.

Using Consult (Nissan's Diagnostic machine)

Turn ignition Off.
Connect ‘‘Consult’’ the data link connector (DLC), located behind fuse box cover.
Turn ignition On.
Touch ‘‘Start.’’
Touch ‘‘Engine.’’
Perform each diagnostic test mode according to each service procedure.

Using Generic Scan Tool

Turn ignition Off.
Connect scan tool’ to its 16-pin DLC, located at lower edge of instrument panel near steering column.
Turn ignition On.
Enter program according to screen instructions or in operation manual.
Perform each diagnostic test mode according to each service procedure.

Clearing Trouble Codes

On pre-95 models, MIL stored memory will be erased after selecting Mode III or Mode IV.

On 95–99 models, MIL stored memory will be erased by switching from Mode II to Mode I.

On all models, MIL stored memory will be erased if battery terminal is disconnected.

On 95–97 models, to erase DTCs using Consult, select ERASE in the SELF DIAG RESULTS mode.

On 98–99 models, to erase DTCs using Consult, turn Consult On, select A/T, SELF DIAG RESULTS and ERASE. Select BACK, ENGINE, SELF DIAG RESULTS and ERASE.

On all models, to erase DTCs using generic scan tool (GST), select mode 4.

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88-94 & 95 Pathfinder, Quest, Truck & 300ZX codes:

ECU  CONSULT  CODE DESCRIPTION
11   P0340   Crank Angle Sensor/CMP Sensor
12   P0100   Air Flow Meter/MAF Sensor
13   P0115   ECT Sensor
14   P0500   VSS
21   P1320   Ignition Signal
22   P0505   Fuel Pump
23   P0605   Idle Switch (On/Off Diagnosis)
24   P0400   Throttle Valve Switch
25   P0150   ISC Valve
28   P1900   Cooling Fan Circuit (Overheat)
31   P0325   ECM
32   P1401   EGR Function
33   P0402   HO2S
34 & 
37   P0130   Knock Sensor
35   P0150   Exhaust Gas Temperature Sensor
36   P0402   EGRC-BPT Valve
38   P0150   LH Bank Closed Loop (B2)
41   P0110   IAT Sensor
42   P0180   Fuel Temperature Sensor
43   P0120   TP Sensor
45           Injector Leak
47   P1335   CKP Sensor
51           Injector Circuit
53   P0130   O2S
54   P0600   A/T Control
55   P0000   No Malfunction
63   P0306   No. 6 Cylinder Misfire
64   P0305   No. 5 Cylinder Misfire
65   P0304   No. 4 Cylinder Misfire
66   P0303   No. 3 Cylinder Misfire
67   P0302   No. 2 Cylinder Misfire
68   P0301   No. 1 Cylinder Misfire
71   P0300   Random Misfire
72   P0420   TWC Function RH Bank
73   P0430   TWC Function LH Bank
76   P0170   Fuel Injection System Function RH Bank
77   P0136   Rear HO2S Circuit
82   P0335   CKP Sensor
84   P1605   A/T Diagnosis Communication Line
85   P1110   VTC Solenoid Valve Circuit
86   P0173   Fuel Injection System Function LH Bank
87   P0443   Canister Control Solenoid Valve Circuit
91   P0135   Front HO2S Heater Circuit RH Bank
94   P1550   TCC Solenoid Valve
95   P1336   CKP Sensor
98   P0125   ECT Sensor
101  P0155   Front HO2S Heater Circuit LH Bank
103  P0705   PNP Switch Circuit
105  P1400   EGR And EGR Canister Control Solenoid Valve Circuit
108  P0443   Canister Purge Control Valve Circuit
     P0600   Continuous Improper A/T Control Unit Voltage To ECM